Do you tow 8K pounds once a month, every month or do you drive 1000 miles every week?   Do you carry 5 people every day?    Why do you think you need a diesel 4 door ?    When you do the math on all the costs like oil changes, repairs, etc.  diesels rarely come out cheaper in the long run.   I'm just sayin . . .

FWIW
ford specs...
   7.3  525 ft./lbs  
   6.0  570 ft./lb

craigslist...
2000 f250 7.3 cc 4x4 153k...$11,500
2005 f250 6.0 cc 4x4 unkn mi....$24950?

its NOT twice the truck.
I dont see it.
6.0=$$$
my .02

Danl

My 7.3 has 160,000 n lets just say im not the nicest to the truck n the only problem ive had was the tranny, but ive seen plenty o stock trannys go out after 100,000 behind a stock motor. I have a custom tuned chip, intake and exhaust and stage 1 injectors n i would never even think of owning a 6blow (no offense to 6.0 owners haha) My good buddy is just hitting 500,000 in his 7.3 as i write this and its been chipped since 200,000, just tranny problems. Just my .02 might not mean much but me n a couple buddies have been through it all with these 7.3s. The Dmax is a good truck minus the IFS junk front end, and the cummins is a great motor but the dodge truck just doesnt doit for me. I live in a small town n diesels are  more popular than any other form of transportation n theres eveything here and every truck has its problems.